Latest or all posts or last 15, 30, 90 or 180 days.
Get up to 16x more storage and 2x the speeds of the original drive

Reader Comment: Sony A7s

Winfried H writes:

What could be the reason, that the Sony A7s has “just” 12MP?

Something to do with the 4K and video optimization?

DIGLLOYD: By using a sensor that is just over 4K video resolution (minimal cropping), the image can be read natively off the sensor with no need for resampling, and the sensor can be optimized for video use knowing that no resampling is needed, and quite possibly optimized in other ways also. A higher-res sensor would require more cropping (self defeating) or more complex resampling (more CPU power needed to do that also) and would pose other optimization and operational challenges.

I don’t know what is state of the art now, but one need only look at the mangled Live View (magnified) of the Nikon D800 to see that the every-3rd-line line-skipping approach makes an awful mess of things (resampling was probably too CPU intensive and still would lead to artifacts). While extracting 4K video out of the 24-megapixel Sony A7 or 36-megapixel Sony A7R presumably is technically feasible (somehow), the issue might be as simple as heat/power and resampling speed (CPU speed).

The 12-megapixel state of the art sensor resolution in the A7s dovetails with 4K resolution demands, but it also extends the brightness (darkness) range for video and stills into previously problematic territory. I see it as part of a natural trend to build cameras that fit into certain usage needs better than jack-of-all-trades solutions.

See also Hits and Misses: Ultra Low Light Photography—Sony A7s vs Nikon Df.

Apple MacBook 12-inch, Mid 2017 (Current Model)

$1599 Only $999

1.3 GHz i5, 8GB, 512GB SSD
Apple Refurbished, Factory Sealed, Apple 1 Year Limited Warranty

Save the tax, we pay you back, instantly!
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 8 hours unless noted. Certain deals may last longer.
$2797 SAVE $600 = 17.0% $246 FREE ITEMS Nikon Z 7 Mirrorless in Cameras: Mirrorless
$2798 SAVE $400 = 12.0% Sony a7R III Mirrorless in Cameras: Mirrorless
$3498 SAVE $1000 = 22.0% Sony a9 Mirrorless in Cameras: Mirrorless
$898 SAVE $100 = 10.0% $161 FREE ITEMS Sony DSC-RX100 VA in Cameras: Point and Shoot
$1879 SAVE $1071 = 36.0% ZEISS 15mm f/2.8 Distagon T* ZE in Lenses: DSLR

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.